JP4969134B2 - Instrument tres check method - Google Patents

Description

  The present invention relates to an instrument trestle check method in a power generation apparatus or the like in which a large number of instruments such as pressure sensors are connected to necessary places by pipes equipped with steam traces.

  Conventionally, in power plants, a large number of instruments such as pressure sensors are connected to the necessary locations by pipes equipped with instrument tresses using steam tresses. The instrument may not show normal operation. Steam steam malfunctions are often caused by freezing in the winter or clogging by foreign matter such as rust. For this reason, regular inspections of steam tresses are conducted. In the power plant, there are a steam tress for fuel oil instruments used throughout the year and a steam tress for general instruments used only in winter. Therefore, the regular inspection is performed on the fuel oil meter steam tress on a predetermined date throughout the year, and the regular meter steam tress is regularly inspected once a month from November to March, for example. . There are two types of check targets in this case: whether or not the operation of the instrument is normal, and whether or not the steamless operation is normal, both of which need to be checked.

  There are two types of conventional check targets, an instrument and a steam tres, and the number of target instruments is extremely large, so that the check work is difficult. Of course, such a check operation is performed in accordance with a predefined manual, but it is also difficult to determine whether the cause of the instrument malfunction is caused by steam stress. In addition, when an instrument malfunction result is obtained, a steamless check must be performed together with the instrument malfunction detection, and the check operation is complicated.

According to the first aspect of the present invention, there is provided an instrument torsion in an apparatus in which a plurality of instruments including pressure sensors are respectively connected to necessary places by a plurality of pipes each provided with an instrument tres by a steam tres having a drain trap. in checking method, the steps of indicating an abnormality of the meter instrument malfunction, a check of the time anomaly the meter indicating the abnormality of the instrument malfunctions, in another daily patrol the periodic inspection, respectively disposed on the meter of the pipe to ascertain the quality of the drain trap said Torres meter has which is a instrument Torres checking method comprising the steps of measuring the temperature of the drain trap by a thermometer, a.

The invention according to claim 2 is the instrument trestle check method according to claim 1, wherein the plurality of instruments including the pressure sensor are respectively provided by a plurality of pipes each provided with an instrument tres by a steam tres having a drain trap. The device connected to the necessary part is a power generation device.

According to the first aspect of the invention, by making the determination of whether drain trap is normal during meter instrument instruction upset, those that can steam or Torres upset, or the meter itself upset at decision.

  According to the invention described in claim 2, since it is applied to a power generation device, a check of a gauge such as a pressure gauge in a power plant where the number of installations and installation locations is extremely diverse, and a steam trap to operate the instrument normally Can be easily performed.

  Embodiments of the present invention will be described with reference to the drawings. First of all, various devices in a power plant are a combination of a huge number of various functional parts. For example, in a boiler or the like, a local local board covered with a casing in the vicinity of the boiler, etc. 1 is provided, and a plurality of gauges 2 such as a number of pressure gauges are provided in the local local board 1 in order to detect the pressure of the piping of each part. In these instruments 2, a pipe 4 provided with an on-off valve 3 is drawn from a boiler (not shown). Each such pipe 4 is provided with a steam tress (instrument tress) 6 connected to the auxiliary steam generator 5. These steam tresses 6 heat the fluid in the pipe 4 by passing the steam supplied from the auxiliary steam generator 5. In FIG. 1, for the sake of clarity, the pipe 4 is wound around the outer periphery of the pipe 4. However, as a specific shape, a thick heat insulation covering the outer periphery of the pipe 4 as shown in FIG. 2. It is constituted by a steam pipe 8 embedded in the heat insulating material 7 together with the material 7. An opening / closing valve 9 and a drain trap 10 are provided at the end of the steam stress 6. Such a drain trap 10 is provided in order to prevent wasteful steam discharge because steam is released into the atmosphere and heat is lost if the end of the steam stress 6 is left as it is. The steam tress 6 is disposed inside the local local board 1 as a steam tress 11 for heating inside the local local board 1 for heating the inside of the local local board 1. An opening / closing valve 12 and a drain trap 13 are also provided at the end of the steam warming 11 for heating in the panel.

  In such a configuration, the operation of the steam tres 6 differs depending on the target instrument. First, the inspection timing of the steam tress 6 is shown in Table 1.

In Table 1, “No. 2” and the target device are described, but this “No. 2” display includes the No. 1 and No. 2 power generation devices, of which No. 2 is the target. It means that. In the type column, “for fuel oil meter” and “for general meter” are shown, and for each, “importance”, “ventilation time”, “stop time”, “ A ventilation test time "is prescribed. First, “for fuel oil meters” is considered to be highly important, and the aeration period is set throughout the year. Therefore, there is no stop time and ventilation test time. In addition, regarding “for general instruments”, the importance is high, the ventilation period is set to 11 to March, the stop period is set to April 1, and the ventilation test period is set to the first week of October. Yes.

Next, the ventilation / stop operation procedure of the steam torches 7 for general instruments will be described.
<Ventilation operation>
1) Conduct a ventilation test in the first week of October.

  2) Switch the solenoid valve snap switch in Unit 2 boiler yard steamless control panel from “automatic to forced open” and conduct a ventilation test.

  3) During the ventilation test, close the drain trap bypass valve and check the drain trap operation.

  4) Turn on the power to the general-purpose instrument temperature recorder.

  5) If trouble spots such as drain traps occur, issue a work request form and implement maintenance by October 31st.

  6) After completion of maintenance, start ventilation in November.

7) If ventilation is started, state that fact on the freeze prevention checklist.
<Stop operation>
1) On April 1st, change the solenoid valve switch in the Unit 2 boiler yard steamless control panel from "forced open to automatic" to stop ventilation.

  2) Turn off the power of the instrument tres temperature recorder.

  3) After stopping the ventilation, open the drain trap bypass valve to prevent rust from being generated by the drain.

  4) If the ventilation is stopped, state that fact on the freeze prevention checklist.

Next, we describe the "Inspection Methods".

  1) For abnormalities, conduct daily patrols.

  2) Records will be collected in the second half of the third week of November.

  3) Table 2 shows the criteria for recording.

  4) When it falls below the judgment standard, it is judged as abnormal and a work request form is issued.

  5) The measurement location is the upper part of the drain trap.

  6) Since the measurement location is high temperature, pay attention to burns and perform measurement.

  Regarding data storage, data is stored in a file and the storage period is one year.

  The measurement results measured in this way are saved in a file as shown in FIGS. That is, what is shown in FIG. 3 is a steamless checklist for a Unit 2 fuel oil meter, and includes a column of measurement date along with items of “solenoid valve name”, “trap number”, and “location”. In this measurement date column, the actually measured “temperature” for each item is described with a numerical value. Now, in the measurement result of “H16.11.11”, because it is for a fuel oil meter, when the judgment standard of measurement value “appropriate 30 ° C. (crude oil pour point 14 ° C.)” is applied, an X mark is attached. Nine locations are identified as having poor drain traps. The determination result, the fact and date of issuing the work request form are described in the remarks column.

  Next, what is shown in FIG. 4 is a steamless checklist for general instruments, and items of “target generator (unit 2)”, “LPB number”, “location”, “trap number”, “trap name” In addition, a column for measurement date is provided. Here, since it is a steam trestle check for general instruments, five measurement columns from November to March are provided. In the state shown in FIG. 4, three measurement results of “H16.11.11”, “H16.12.18”, and “H17.01.31” are shown. Here, as clearly shown in Table 2, the determination criterion of the measured value is “general detector temperature (freezing prevention) + 10 ° C. is suitable”, and therefore, when measuring “H16.11.11”, In three places marked with “H16.12.18” and “H17.01.31”, one place marked with an X is a trap failure. In the remarks column, it is described whether or not a work request slip has been issued.

  As described above, the temperature of the drain trap 10 or 13 is detected both in the case of the steamless check for the Unit 2 fuel oil meter and in the case of the steamless check for the general meter. Although it is checked whether or not there is an abnormality, if it is an abnormality in the meter 2, it is presumed that there is an abnormality in the drain trap 10 or 13 indirectly. As a result, rust is generated in the drain trap 10 or 13, foreign matter is mixed in, and steam does not normally pass through, so that repair and inspection work is required.

It is a conceptual diagram which shows the embodiment of this invention and shows the instrument connected by piping. It is the side view which notched some showing the piping in which the steam pipe was arrange | positioned. It is a steam tress checklist for fuel oil meters. This is a steamless checklist for general instruments.

Explanation of symbols

2 Instrument 4 Piping 6 Steam Torres 10 Drain trap 13 Drain trap

Claims (2)

In the instrument trestle check method in a plurality of instruments including pressure sensors, each connected to a required location by a plurality of pipes each provided with an instrument tres by a steam tres having a drain trap,
A step in which the instrument shows an abnormality in the instrument;
As inspection during abnormal indicating abnormality of the meter instrument malfunction, a different daily patrol the periodic inspection, for assessing the quality of the drain trap said Torres for the instrument which is disposed respectively in the piping of the instruments have And measuring the temperature of the drain trap with a thermometer,
A trestle check method for an instrument characterized by comprising:   The plurality of instruments including the pressure sensor are connected to the necessary places by a plurality of pipes each provided with an instrument trace by a steam tress having a drain trap, and the apparatus is a power generator. The instrument trestle check method according to 1.

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